Without wear and tear, like tyres, brake pads etc.etc.etc. My car costs me just over £800/annum to stand on the front with VED, insurance, MOT and a service. At 40mpg it costs around 15.5p/mile in fuel. I drive around 5500 miles a year so total cost/mile is around 30p/mile or 40p if I factor in the odd tyre and brake pad replacement. THEN you need to add in the cost of the car less the trade in value when I sell it. Which last time I swapped cars came to around 19p per mile driven.
So the total cost for me is around 60p/mile. If I covered a much higher annual mileage the capital cost/mile would fall by a good chunk, although wear and tear costs would rise.
Ultimately, the only way you can reduce the cost per mile of car ownership is to actually use it more - thanks in greater part to VED, and insurance premium tax - as well as VAT on servicing, and consumables, and that is before you even start the engine.
If the gov were truly demanding that car mileage falls, it would reduce the taxes on static ownership cost, and increase the tax on the fuel duty to make people think long and hard about what they consider to be essential mileage.
Banning private cars from the road is really a dumb idea as the alternatives are very disjointed, and for the greater part impractical, but I do believe that a bit of joined up thinking could actually retain the utility requirement whilst reducing private car journey miles, and thus make the roads a nicer and safer place to be for all.